diff --git a/lib/src/timing/MillisecondTimer.cpp b/lib/src/timing/MillisecondTimer.cpp
index 29ad353e..3ef332e4 100644
--- a/lib/src/timing/MillisecondTimer.cpp
+++ b/lib/src/timing/MillisecondTimer.cpp
@@ -30,7 +30,7 @@ namespace stm32plus {
    * @param millis The amount of time to wait.
    */
 
-  inline void MillisecondTimer::delay(uint32_t millis) {
+  void MillisecondTimer::delay(uint32_t millis) {
 
     uint32_t target;